Widget attributes Qt::WA_Resized and Qt::WA_Moved are not consistently set on all platforms

See a new tst_QWidget::movedAndResizedAttributes autotest from commit: 6d44daddab9f36fd8c34bb3776c0fb0d93635e6e and FixMe in there.

Results from different platforms:

• For desktop linux, all tests pass (OK?)
• For symbian, all tests pass (OK?)
• For Windows, one test fails (QTBUG-8911)
• For MAC and QWS, already the second test fails (WA_Moved is set after setWindowState(Qt::WindowFullScreen))

The attribute usage should be harmonized for different paltforms, if possible without breaking the compatibility.